As I have two elastic nodes and set both of their "data.path" to "`/var/elastic/data`

".

After indexing data, I found a strange state:

the first node:

`/var/elastic/data/0/....indices`

the second node:

`/var/elastic/data/0/...indices`

`/var/elastic/data/1/...indices`

why the second node has directory "1" and "0" while the first only has "0"?